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Compounds Each compound has it’s own specific properties that may not always be like other similar compounds. Carbon Monoxide vs. Carbon Dioxide [http://wps.prenhall.com/wps/media/objects/476/488316/Instructor_Resources/Chapter_05/FG05_06-02a.JPG]

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Ions These are formed when an atom gains or loses electrons They have the same number of electrons as a noble gas (octet rule!) Fluorine p + = 9 e - = 9 Fluoride Ion p + = 9 e - = 10 [http://www.bbc.co.uk/schools/gcsebitesize/img/gcsechem_97.gif]

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Ions The number of electrons gained or lost is written as the oxidation number or charge of the ion. 9 protons -10 electrons -1 charge or F -1 [http://www.bbc.co.uk/schools/gcsebitesize/img/gcsechem_97.gif]

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Ions Is there a pattern to the ions? No true pattern No compounds or ions!